Reversible propeller



JUL 14, 1947. c. JoHANsEN REVERSIBLE PROPELLER Filed Sept. 17, 1945 2Sheets-Sheet 1 lIl 1". m czll!" Afronnzvs ihn.

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REVERSIBLE PROPELLER Filed sept. 1v, 1943 `2 sheets-sheet 2 4 wwwmagiafim! lf w INVENTOR WITN [Il Patented Jan. 14, 1947 UNITED STATES PATENTOFFICE REVERSIBLE PROPELLER Christopher Johansen, Los Angeles, Calif..

fApplication September 17, 1943, Serial No. 502,821

2 Claims. 1

My invention relates to ship propellers, and has among its objects andadvantages the provision of an improved reversible propeller.

In the accompanying drawings:

Figure 1 is a longitudinal sectional view of the propeller structure.

Figure 2 is a perspective view of a propeller blade mount. a

Figure 3 is a view taken from the position indicated by line 3-3 ofFigurel.

Figure 4 is a top plan view of a part of the propeller structure, with aportion broken away.

Figure 5 is a detail view of a blade adjusting member, and

Figure 6 is a sectional view along the line 6--6 of Figure 1, but withthe propeller blades illustrated in elevation.

In the embodiment of the invention4 selected for illustration. I makeuse of an engine driven shaft I0 provided with a coupling I2 forconnection with the remainder of the shaft leading to the engine (notshown). This shaft extends loosely through a tubular shaft I4, and oneend of the tubular shaft is threadedly connected at I E with a body I8to which are connected sections 20 of a propeller hub housingr 22, as at24. A packing nut 26 is threadedly connected with the other end of thetubular shaft I4 to establish a watertight joint between the two shafts.I0 and To one end of the shaft I0 is threadedly connected a body 28having a reversely threaded bore 30 for threaded connection with thestems 32 on two propeller blades 34. TheV shaft I0 is threadedlvconnected at 36 with the body 28.

The body I8 includes two parallel strap members y38 which are spaced butarranged face to face in parallelism with the shaft I4. The two membersBitrate continuous with a curved length 40, Each blade 34 includes ashort arm 42 lying close to the two members 38, see Figure 6. Slots 44are provided in the arms 42 for the reception of pins 4B threaded intoenlargements 48 formed on the members 38. Thus axial movement of thetubular shaft I4 relatively to the drive shaft I0 imparts turningmovement to the propeller blades 34 for pitch changing and reversingpurposes. One blade 34 is connected with one member 88. and the stems 34rotate in the'bore 30 when the blarles 34 are turned about their axes.

Means for actuating the tubular shaft I4 comprises a lever 50 having alatchpawl 52 coacting with a quadrant 54. This lever is pivotallyconnected at 58 with a rod 58 pivotally connected at 60 with an arm 82flxedly attached to a shaft 84,

see Figure 3. This shaft is rotatably supported in bearings 66 mountedon pedestals 58 bolted to a support 10.

To the shaft 64 is flxedly connected a collar 12 having two bowed arms14 provided with pins 18 riding in a circumferential groove 18 in acollar 80, see Figures 1 and 3. In Figure 1, the collar 80 is clampedbetween thrust bearings 82 mounted on the tubular shaft I4. Pivotalmovement of the lever 50 rotates the shaft 64 for imparting oscillatorymotion to the arms 'I4 and longitudinal movement of the tubular shaft I4relatively to the drive shaft I0.

A portion of the cylindrical body I8 nts snugly inside one end of asleeve 84, which sleeve is provided with an annular -ange 86 fittingclosely to the tubular shaft I4. Packing material 88 is provided in thesleeve 84 adjacent the flange 8B. and

-a packing member 90 is mounted' on the tubular shaft I4 for coactionwith. the ange 88 to e8- tablish a liquid tight connection. Both thesleeve 84 and the member 80 are provided with anges 92 through which areextended bolts 94 for drawing the member 90 inwardly of the sleeve 84.'I'he packing 88 prevents water from leaking ln between the two shafts.

The sections 20 are overlapped at 88 and ilxedly united by bolts 98. Aspacing sleeve |00 is in terposed between each section 20 and one member38, and bolts I02 extend through the sections 20, the sleeves |00 andare threaded into the members 38 Without further elaboration, theforegoing will so fully explain my invention, that others may, byapplying current knowledge, readily adapt the same for use under variousconditions of service.

shaft, propeller blades, a body on the endl 4of the drive shaft having areversely threaded transverse bore therethrough, the blades having stemsloosely threaded into said bore in said body in axial alignment witheach other to rotate about their longitudinal axes and for rotation as aunit with the drive shaft, a tubular shaft slidably mounted on the driveshaft, a cylindrical body on said tubular shaft having parallelconnected strap members curved at their forward part, and said bladeshaving lateral arms loosely connected with the strap members to reversetheir screw through longitudinal shaftng of the tubular* shaft, meansfor shifting the tubular shaft, and a. housing fixed to said cylindricalbody having open parts through which the blades extend, the

'housing surrounding'said first and second bodies.

2. A reversible propeller comprising a drive shaft, a body on the end ofthe drive shaft having reversely threaded bores therethrough, propellerblades having stems loosely threaded`in said bores in axial alinementwith each other tooscillate therein and for rotation as a unit with thedrive shaft, a tubular member siidably mounted on said shaft and havingtwo spaced arms engaging opposite sides of the body and of a width equalto that of the body and connected together at their outer ends, anoutwardly extending arm carried by each propeller blade on 10 member onsaid shaft.

CHRISTOPHER J OHANSEN.

